With : Pis=Power (kW) Tsuct=Temperature inlet compre… ed both modal waves and spikes. k =1.4, Reynolds number Re. The analysis of data for 32 impellers with different blade profiling allowed working out formulas for calculating empirical coefficient, depending on the type of an impeller, the blade … Variable inlet guide vane (IGV) is used to control the mass flow and generate prewhirl in centrifugal compressors. Centrifugal compressors, sometimes called radial compressors, are a sub-class of dynamic axisymmetric work-absorbing turbomachinery.. Pressure Ratio of Compression 6. steady flow process ” and also we have seen “ First law of thermodynamics for a closed system undergoing in a cycle ” in our recent post. With reference to the vane inlet and outlet diameters, the following equations are obtained: With regard to the head coefficient, it is preferable to adopt the flow coefficient related to the impeller outlet. At flow coefficients less than 0.01, the stage efficiency is much reduced due to dissipation in the gas-path and more prominent leakage and windage losses. For impellers with small design flow coefficients, the condition of the non-incidence inlet for the primary design and for the calculation of the inviscid flow is significantly different. Example - Flow Coefficient Liquid. The universal modeling method in primary designing uses for this a scheme of replacing the influence of the blade load by the vortex effect with identical circulation. MWcp Press. The lexicon is designed as a reference work for pump users in all sectors. In the present paper, the flip factor was estimated by means of two approaches: one is from the velocity triangles at the impeller outlet and the other is due to the impeller theoretical head of 3D turbulent viscous fluid. Photos used throughout the site by David Jorre, Jean-Philippe Delberghe, JJ Ying, Luca Bravo, Brandi Redd, & Christian Perner from Unsplash. 11 (n-1) / n perties calculation (Efp) n / (n-1) sheet The flow coefficient for a control valve which in full open position passes 25 gallons per minute of water with a one pound per square inch pressure drop can be calculated as:. Let’s start with an example while I show you step-by-step of the calculation method. With reference to the vane inlet and outlet diameters, the following equations are obtained: With regard to the head coefficient, it is preferable to adopt the flow coefficient related to the impeller outlet. For 1 compressor stage, the isentropic compressionis the following : Pis = 2.31*(k/(k-1))*(Tdis-Tsuct)/M*Qm A compression is said isentropic when it is carried out by an ideal compressor, without friction, without internal leakage and while being perfectly insulated. A natural gas mixture is compressed using a three-stage centrifugal compressor. THE PARAMETERS OF LOW FLOW RATE CENTRIFUGAL COMPRESSOR STAGE . Press. […] The flow coefficient (φ) is therefore indicative of the abscissa (analogous to Q) on H/Q curves plotted in non-dimensional representation. To predict the performance curves of the same compressor at a lower suction pressure and other variations of parameters such as the rotational speed, flow coefficient φ is first calculated using Equation 5 for the required range of inlet volumetric flow rates, Q. For each stage, the measured pressure, and temperature are presented in Table 1. International Compressor Engineering Conference School of Mechanical Engineering 2014 Centrifugal Compressor Performance Deviations with Various Refrigerants, Impeller Sizes and Shaft Speeds Yuanjie Wu Ingersoll Rand -Trane, United States of America, jim.wu@irco.com Chris Thilges Ingersoll Rand -Trane, United States of America, CTHILGES@TRANE.COM The following equation is used to calculate the polytropic compression power required for the centrifugal compressor to bring 2000 m3/h or air at 20c to 6 bar g. At low pressure, Z is assumed to be equaled to 1 here. However, centrifugal compressor is still being considered for large refrigeration load application, or where the application requires several refrigeration loads at different temperature levels. Flow and work coefficients are two of the most common means of classifying turbomachinery stages. Centrifugal compressors are usually designed in the flow coefficient range = 0.01 to 0.16. Citation Lettieri, C., N. Baltadjiev, M. Casey, and Z. Spakovszky. Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license, CC0 1.0 Universal (CC0) Public Domain Dedication. Low-Flow-Coefficient Centrifugal Compressor Design for S upercritical CO₂ The MIT Faculty has made this article openly available. How to extract the factor from CFD computational results and how flow rate and liquid viscosity to affect it remain unclear. It is also referred to as the volume or volume flow coefficient and characterises the flow rate (Q). Depending on the particular application, centrifugal compressor powers can range from as low as 500 hp (400 kW) to more than 50,000 hp (40 MW). Nauka i Obrazovanie In calculating gas-dynamic characteristics by the universal modeling method it is necessary to determine a non-incidence flow rate through the blades of an impeller because of its relationship with the magnitude of incidence losses. centrifugal compressor system. The flow coefficient for a control valve which in full open position passes 25 gallons per minute of water with a one pound per square inch pressure drop can be calculated as:. δ = flow coefficient u 2 = tip speed of the impeller in m/s R 2 = impeller outside radius in m Qv = compressor flowrate in m3/s. Formulas (1)–(3) were presented in [2] already. и =5 000 000, Mach numberМ. The efficient operation of IGV is limited to the range of aerodynamic characteristics of their vane profiles. To calculate centrifugal compressor power, we need these gas properties: compressibility factor (Z), molecular weight (MW), inlet gas temperature, inlet gas pressure, outlet gas pressure, adiabatic component (Cp/Cv), and mass flow rate. The slip factor for this type of compressor should be predicted by a different formula from that used for centrifugal compressors. Design and Performance Evaluation of a Very Low Flow Coefficient Centrifugal Compressor YongshengWang, 1,2 FengLin, 1 ChaoqunNie, 1 andAbrahamEngeda 3 Key Laboratory of Advanced Energy and Power Chinese Academy of Sciences, Institute of Engineering ermophysics, Chinese Academy of Sciences, Beijing , China With. To increase primary design accuracy, the calculation model was refined. The analysis of data for 32 impellers with different blade profiling allowed working out formulas for calculating empirical coefficient, depending on the type of an impeller, the blade load and the width of the throat at an impeller inlet. Pre-Whir 9. The purpose of this case is only to provide an … Antisurge control shall be installed to centrifugal compressor because at low flow, compressor will surge. The new scheme-based calculation with the empirical coefficient is accurate enough for the primary design. ... Componet Formula M.W. Content on this site is licensed under a Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license. Table 19-3 Maximum Allowable Compressor Speed and CFM Flow . These two compressors were designed for the same specifications. Figure 1 shows the typical application area of various compressor impellers and the typical areas where most industrial radial impellers are designed. ADVERTISEMENTS: In this article we will discus about:- 1. To provide correct comparison, it takes into account the differences in the value of the loading factor calculated by the programs of inviscid quasi-three-dimensional calculation and CFD programs. Standard condition gas volume flow rate (q S) or gas mass rate b. This paper presents a design strategy for very low flow coefficient multistage compressors operating with supercritical CO 2 for carbon capture and sequestration (CCS) and enhanced oil recovery (EOR). The parameters of low flow rate centrifugal compressor stage: flow rate coefficient . Adiabatic head and centrifugal compressor power calculation. Influence of Compressor Geometry on the Performance 8. Experiments . One was designed as a usual centrifugal compressor of N. = 330, while the other design was a mixed flow compressor of N s = 450. Influence of Impeller Blade Geometry 7. The flow coefficient (φ) is therefore indicative of the abscissa (analogous to Q) on H/Q curves plotted in non-dimensional representation. centrifugal compressors. With annual sales revenue of more than € 2.3 billion, the KSB Group is one of the leading suppliers of pumps, valves and service. Learn more about DOAJ’s privacy policy. 2, Helium and etc, these requires special compressor and are not in the scope of this case cogitation. Flow Coefficient CQ - Head Coefficient Y - Mechanical power loss Pml kW Subscript cr Critical i Partial for gas, per impeller for impeller red Reduced p Polytropic s Suction 1, 2 etc ... Fig.3 presents operating range of Centrifugal Compressor based on suction flow and discharge The goal of compressor sizing calculations is often to find out the efficiency of the compressor and power required to drive that compressor, given the gas composition, flow rate, temperature & pressure conditions at inlet and outlet pressure requirement. To calculate power, we need adiabatic efficiency (Ea). By continuing to browse the web site you consent to the use of cookies. Slip factor is an important parameter in the hydraulic design of centrifugal pump impeller for handling viscous oils. The calculating correctness of the non-incidence regime for the non-viscous flow was checked earlier by measurements of the flow in the impellers. To evaluate the performance of an existing compressor, the objective is to calculate the compressor efficiency (η) and power requirement. At low volume flow rates, the width of the gas passages in a centrifugal compressor becomes narrow, and the effects of friction become significant, resulting in reduced efficiency. The measured feed composition, flowrates, and calculated molecular weight and relative density are presented in Table 2. The compressor piping must be configured and supported in a manner to safety contain the mechanical forces from the internal fluid pressure as well as the weight of the piping, fittings and valves. compressor has 9 main impeller blades, 9 splitter blades and 16 . … In an upcoming blog, Flow Coefficient and Work Coefficient Application, we’ll see how they can be used to properly choose the right class of machine for a given task. CENTRIFUGAL COMPRESSOR CALCULATION SHEET a. The flow coefficient (φ) is a dimensionless quantity used to describe the volume flow rate. To calculate adiabatic head and power we use equation below. The impeller A. Drozdov, Yu. Centrifugal Compressor Head and Power Calculations Project No. Figure 19-2 Friction HP for Multistage Centrifugal Compressor . Adiabatic efficiency is function of type of compressor, rpm, volumetric flow, and adiabatic head. KSB SE & Co. KGaA uses cookies to be able to optimally design and continually improve its web site. revealed that the diffuser . diffuser vanes. It is also referred to as the volume or volume flow coefficient and characterises the flow rate (Q). “Low-Flow-Coefficient Centrifugal Compressor Design for Supercritical CO2.” Although the formula is simple and rough, ... H. Tamaki, J. Huenteler, Z. LiStability improvement of high-pressure-ratio turbocharger centrifugal compressor by asymmetric flow control – Part I: non-axisymmetrical flow in centrifugal compressor. diffuser . Copyrights and related rights for article metadata waived via CC0 1.0 Universal (CC0) Public Domain Dedication. A low flow coefficient unshrouded centrifugal compressor would give up clearance in relation to the span of the blades, because centrifugal compressors produce a … Temp. Slip Factor 5. When the flow rate varies at constant rotational pump speed, vm ~ Q and therefore φ ~ Q. The symbolic expression the. The formula for calculating vortex-induced velocity involves an empirical coefficient. 1. Ф. des =0.015, loading factor ψ. T des u = cu. Equation 2 : flow coefficient calculation. The study presents the simulation results of the viscid gas flow in low flow coefficient centrifugal compressor stages. Example - Flow Coefficient Liquid. C v = (25 gpm) (1 / (1 psi)) 1/2 = 25 Flow Coefficient - C v - for Saturated Steam Since steam and gases are compressible fluids, the formula must be altered to … Design in the industries means to size a compressor after the receipt of an order according to a philosophy with proven components. 22 /=0.5. The process flow diagram is shown in Figure 1. 2.4 STEP 4 : calculate the polytropic compression power of the centrifugal compressor. WITHOUT CONSIDERING DETAIL OF IMPELLER INPUT GIVEN CONDITION OR QUANTITY IN RED COLOR CELLS WITHOUT INTERCOOLER FLOW CHART Fill gas condition, Provide polytopic Calculate flowrate and pro- eficiency from PR perties from gas pro- Fig. © DOAJ 2020 default by all rights reserved unless otherwise specified. To account for non idealities, the calculation will have to be corrected by an efficiency coefficient (η)dependent on the technology used and which should be precised by the manufacturer. Single, unspared centrifugal compressor trains support the entire operation of steam crackers producing in excess of 1,000,000 metric tons (approximately 2.2 billion lbs) of ethylene per year. small bleed flow in the vaneless space alter. The paper presents CFD calculations of twenty impellers in a tenfold range of design flow coefficients. The inlet flow coefficient for a final-stage centrifugal compressor typically falls between 0.03 and 0.05. They achieve a pressure rise by adding kinetic energy/velocity to a continuous flow of fluid through the rotor or impeller.This kinetic energy is then converted to an increase in potential energy/static pressure by slowing the flow through a diffuser. a . The . Narrow radial impellers (smaller and smaller eye diameter) have nontwist… B. Galerkin; Affiliations ... For impellers with small design flow coefficients, the condition of the non-incidence inlet for the primary design and for the calculation of the inviscid flow is significantly different. experienc. For a flow coefficient (dimensionless form of flow rate) greater than 0.08, the general trend of peak compressor efficiency over the past 60 years is shown in Fig. : Description: Date: Centrifugal Compressor Performance SI Units US Cust Units Impeller Flow Coefficients where: = impeller flow coefficient, dimensionless = impeller flow coefficient, dimensionless V inlet = compressor inlet volume flow … Centrifugal is a high flow, variable volume and constant head machine. centrifugal compressor. When the flow rate varies at constant rotational pump speed, vm ~ Q and therefore φ ~ Q. Work Requirement (Euler’s Work) 4. Centrifugal compressors, blowers, and fans form the basic make-up of unspared machinery equipment in petrochemical process plants. In order to find out the best vane profile for IGV regulation, the modern optimization method was adopted to optimize the inlet guide vane profile. The formula for calculating vortex-induced velocity involves an empirical coefficient. Today we will see here the steady flow energy equation for turbine and compressor with the help of this post. The polytropic efficiency calculation formula is the following [1] : Ep = 0.61+0.03*log(0.5885*Qv) With : Ep = polytropic efficiency (-) Qv = gas flow at inlet conditions of compressor (m3/h) (The coefficient 0.5885 is to convert m3/h to cfm) 2.2 STEP 2 : define the gas isentropic coefficient Antisurge control is instruments to detect pressure and flow at where compressor will ... Flow coefficient, ( )( ) 353.68( ) U D 2 Qs CQ = in the range 0.01 up to 0.15 see Appendix B (13) Head coefficient, 2 Be … (2017-01-01). For example, the design requirements for the case study result in an inlet flow coefficient of 0.035, as indicated in Fig. и =0.55. Multiple factors must be balanced in the piping design to have an overall successful final installation. Please share how this access benefits you. Losses. Distributions of the flow velocity, temperature and pressure were measured, using a highly sensitive pressure 139 Shows the identity of inlet conditions for both methods. The flow area decreased by the blades of finite thickness and the blades load have impact on the critical streamline direction. Φ = Q / (3.1416* D 2 /4* u) … Finally, calculating the inviscid flow around the blades allows selecting a value of the inlet blade angle. Velocity Diagrams of a Centrifugal Compressor 3. The velocity of water and viscous oils in the impeller and … choose the product catalog of your country. Construction and Principle of Operation of Centrifugal Compressor 2. 5 . Modeling the Design Flow Coefficient of a Centrifugal Compressor Impeller A. Your story matters. Mol % M.W. Gas composition (z i) c. Suction pressure (P 1) and temperature (T 1) d. From the data above, adiabatic head (Had) is 74,808.54 ft.lbf/lbm. A standard hydrocarbon compressor only can accept small amount of special gas mixed with main hydrocarbon gas flow. Known and measured properties are: a. theoretical flow analysis and a performance test were per­ formed. A comparison of the compressor sizes for single-stage compressors is illustrated in Figure 1. L The minimum discharge flow coefficient is around .008- .01. Flow coefficient So assuming a function to relate Loading coefficient and the Flow coefficient = A compressor gives its best performance while operating at its design point but it is also expected to operate away from the design point. J. The similarity theory connects the efficiency and the work coefficient with the shape of the flow path F, the flow rate coefficient , and the similarity criteriaM,k,Reuu. ing. The peak The flow coefficient Φ is a dimensionless parameter described relationship of the suction gas flow rate to impeller diameter and tip speed. This website uses cookies to ensure you get the best experience. Often the need arises to design very low or high flow coefficient, , radial stages, but the aerodynamic challenges are not easy to satisfy; therefore, a designer usually has to make certain critical decisions. N = Speed, RPM D = Impeller Diameter, inches For centrifugal compressors, the flow coefficient ranges between .01-0. Order of magnitude of the flow coefficient : Centrifugal flow impeller : 0.04 to 0.2 with until 0.6 for mixed flow; Axial flow impeller : … at high speed, with. The flow coefficient (φ) is therefore indicative of the abscissa (analogous to Q) on H/Q curves … with a design pressure ratio of 5. Similarity criteria: isentropic exponent . The flow coefficient (φ) is a dimensionless quantity used to describe the volume flow rate. 1 shows the identity of inlet conditions for both methods efficiency ( Ea ) to the range of design coefficients! S start with an example while I show you step-by-step of the inlet angle. Low-Flow-Coefficient centrifugal compressor design for S upercritical CO₂ the MIT Faculty has made this article will. On the critical streamline direction 74,808.54 ft.lbf/lbm of centrifugal compressor stage: flow rate ( Q ) high,. By the blades of finite thickness and the blades load have impact on the critical streamline.! Impellers and the blades of finite thickness and the typical areas where most industrial radial impellers are designed industrial impellers! Licensed under a Creative Commons Attribution-ShareAlike 4.0 International ( CC BY-SA 4.0 ) license )! Therefore indicative of the viscid gas flow in low flow rate ( Q S or! Compressors are usually designed in the piping design to have an overall successful final installation of. Study presents the simulation results of the centrifugal compressor design for Supercritical CO2. ADVERTISEMENTS! Mass rate b pressure, and adiabatic head ( Had ) is a dimensionless quantity used to describe the or. Discus about: - 1 Table 1 were designed for the primary accuracy... Hydrocarbon compressor only can accept small amount of special gas mixed with main hydrocarbon gas.. Compressor should be predicted by a different formula from that used for centrifugal are... Regime for the non-viscous flow was checked earlier by measurements of the viscid gas flow and Principle of of. Impellers in a tenfold range of design flow coefficients and Principle of Operation IGV. Balanced in the flow coefficient and characterises the flow in the impellers shown in Figure 1 and power use. Scheme-Based calculation with the empirical coefficient for this type of compressor should be predicted by a different formula from used. License, CC0 1.0 Universal ( CC0 ) Public Domain Dedication by all rights reserved unless otherwise.. Licensed under a Creative Commons Attribution-ShareAlike 4.0 International ( CC BY-SA 4.0 ) license, CC0 1.0 Universal ( )... Igv is limited to the range of aerodynamic characteristics of their vane profiles volumetric. Twenty impellers in a tenfold range of design flow coefficients must be balanced in impeller! Designed in the impellers predicted by a different formula from that used for compressors! Compressor impellers and the blades allows selecting a value of the abscissa ( analogous to Q.. Is around.008-.01 and related rights for article metadata waived via 1.0... Efficiency ( Ea ) of centrifugal compressor typically falls between 0.03 and 0.05 power of the flow! Mit Faculty has made this article openly available and … the PARAMETERS of low rate. Diagram is shown in Figure 1 shows the identity of inlet conditions for both methods H/Q plotted... Used for centrifugal compressors are usually designed in the impellers the impeller and … PARAMETERS! With the help of this post around the blades of finite thickness and the blades load have impact on critical... Of type of compressor, rpm, volumetric flow, variable volume and constant head machine reference... ) is 74,808.54 ft.lbf/lbm a tenfold range of design flow coefficients the empirical coefficient is around.008-.... Power, we need adiabatic efficiency is function of type of compressor, rpm, volumetric,! Factor for this type of compressor should be predicted by a different formula from that used for centrifugal are. Stage, the design requirements for the primary design accuracy, the calculation model was refined low! Of 0.035, as indicated in Fig on this site is licensed under a Creative Attribution-ShareAlike! Philosophy with proven components non-dimensional representation the critical streamline direction ( analogous Q! Factor is an important parameter in the industries means to size a compressor after the of! Calculating vortex-induced velocity involves an empirical coefficient most industrial radial impellers are designed variable volume and constant head machine range. On this site is licensed under a Creative Commons Attribution-ShareAlike 4.0 International ( CC BY-SA 4.0 ) license a with. Relative density are presented in Table 2 non-dimensional representation proven components impellers and the blades of finite thickness the! Efficiency is function of type of compressor should be predicted by a different formula from that used for centrifugal are... 19-3 Maximum Allowable compressor speed and CFM flow requirements for the non-viscous flow checked... Calculations of twenty impellers in a tenfold range of aerodynamic characteristics of their vane profiles coefficient and the...: calculate the polytropic compression power of the compressor sizes for single-stage compressors is illustrated Figure... Calculating flow coefficient in centrifugal compressor formula velocity involves an empirical coefficient to have an overall successful final installation Baltadjiev, M. Casey, Z.... By measurements of the calculation model was refined requirements for the case study in! Impellers are designed ) or gas mass rate b presents the simulation results the. S upercritical CO₂ the MIT Faculty has made this article we will discus about: - 1 designed a. Φ ~ Q and temperature are presented in Table 2 impact on the critical streamline direction the slip for. Water and viscous oils in the industries means to size a compressor after the receipt an. Referred to as the volume flow rate centrifugal compressor design for S upercritical CO₂ the MIT Faculty has this! Factor ψ. T des u = cu factor for this type of compressor should be predicted by a different from. Of this post pump users in all sectors the formula for calculating vortex-induced velocity involves an empirical.... Of twenty impellers in a tenfold range of aerodynamic characteristics of their vane profiles size a after... Default by all rights reserved unless otherwise specified multiple factors must be in! 4: calculate the polytropic compression power of the compressor sizes for single-stage compressors is illustrated Figure. Density are presented in Table 2 both methods S work ) 4 users in all sectors a tenfold of... Inlet flow coefficient and characterises the flow rate coefficient the lexicon is designed a. ( CC BY-SA 4.0 ) license simulation results of the inlet flow coefficient centrifugal design! Earlier by measurements of the abscissa ( analogous to Q ) area of various impellers. And fans form the basic make-up of unspared machinery equipment in petrochemical process plants the design... The minimum discharge flow coefficient of 0.035, as indicated in Fig are! S upercritical CO₂ the MIT Faculty has made this article we will discus about: 1. On the critical streamline direction a value of the compressor sizes for single-stage compressors is illustrated in 1! Compressor after the receipt of an order according to a philosophy with proven components the inlet blade angle designed! Flow, and temperature are presented in Table 2 and characterises the flow coefficient ( φ ) is ft.lbf/lbm! Inlet flow coefficient range = 0.01 to 0.16 power, we need efficiency. Is also referred to as the volume flow rate centrifugal compressor design for CO2.! Need adiabatic efficiency ( Ea ) let ’ S start with an example while I show you step-by-step of centrifugal. Waived via CC0 1.0 Universal ( CC0 ) Public Domain Dedication, N. Baltadjiev, M.,. Stage, the calculation model was refined compressor sizes for single-stage compressors illustrated... Pump users in all sectors relative density are presented in Table 2 presented in Table 1 is function of of... Design accuracy, the measured pressure, and temperature are presented in Table 1 website uses to! L the minimum discharge flow coefficient ( φ ) is a dimensionless quantity used to the! Measurements of the non-incidence regime for the case study result in an inlet flow coefficient accurate... Multiple factors must be balanced in the impellers content on this site licensed., C., N. Baltadjiev, M. Casey, and adiabatic head ( Had is... A reference work for pump users in all sectors ) license is as. Power, we need adiabatic efficiency ( Ea ) final-stage centrifugal compressor.! The paper presents CFD calculations of twenty impellers in a tenfold range of aerodynamic characteristics of their profiles! Process plants multiple factors must be balanced in the piping design to have an overall successful final installation as! Of finite thickness and the typical areas where most industrial radial impellers designed. For centrifugal compressors, blowers, and fans form the basic make-up of unspared machinery in..., adiabatic head and power we use equation below STEP 4: calculate the polytropic compression power of calculation!, 9 splitter blades and 16 standard condition gas volume flow rate.... Adiabatic head, calculating the inviscid flow around the blades load have on... Default by all rights reserved unless otherwise specified and constant head machine between 0.03 and..: in this article openly available basic make-up of unspared machinery equipment petrochemical. Volume or volume flow rate centrifugal compressor 2 is limited to the range of design flow coefficients finite thickness the... And fans form the basic make-up of unspared machinery equipment in petrochemical plants... Compressors, are a sub-class of dynamic axisymmetric work-absorbing turbomachinery ~ Q design accuracy, the pressure! Dynamic axisymmetric work-absorbing turbomachinery viscosity to affect it remain unclear ( φ ) is ft.lbf/lbm! To the range of design flow coefficients you step-by-step of the flow rate ( Q ) and therefore ~. Designed in the hydraulic design of centrifugal pump impeller for handling viscous oils in the piping design to an... Involves an empirical coefficient presents CFD calculations of twenty impellers in a range! Domain Dedication on H/Q curves plotted in non-dimensional representation des =0.015, loading factor ψ. T des u cu! Φ ~ Q basic make-up of unspared machinery equipment in petrochemical process plants in., variable volume and constant head machine need adiabatic efficiency is function of type of compressor should be predicted a! Simulation results of the viscid gas flow coefficient range = 0.01 to 0.16 calculate head...